Patents by Inventor Mitsuru Takashima

Mitsuru Takashima has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Diaphragm for a loudspeaker
    Patent number: 4275278
    Abstract: A diaphragm for a loudspeaker includes a core member having a flat front surface from which a frustum-shaped side surface extends to a back portion, a cover member secured to the back portion and adapted to be connected to a voice coil bobbin of the loudspeaker, an outer radiation layer mounted on the front surface and having a relatively high resonance sharpness, and an intermediate layer laminated between the front surface and the outer radiation layer and having a resonance sharpness lower than that of the outer radiation layer.
    Type: Grant
    Filed: August 17, 1979
    Date of Patent: June 23, 1981
    Assignee: Sony Corporation
    Inventors: Sadaaki Sakurai, Mitsuru Takashima, Masana Ugaji